# BaseETH

Source: https://developers.bitgo.com/docs/baseeth

## Overview

BaseETH ( Base Ethereum) is a Layer 2 scaling solution for Ethereum built by Coinbase using the OP Stack, the same technology powering Optimism. Base uses optimistic rollup technology to process transactions off-chain while posting compressed data to Ethereum mainnet for security.

Base implements EVM equivalence at the bytecode level through the Optimism Virtual Machine. The network uses sequencers to order transactions and achieve fast block times. Base inherits Ethereum's security through a fraud proof window during which invalid state transitions can be challenged. The network uses ETH for gas fees and supports all Ethereum transaction types including EIP-1559.

## Explorer

<a href="https://base.blockscout.com/" target="_blank" rel="noreferrer">https://base.blockscout.com/</a>

## Wallets Types

BitGo enables holding BaseETH in the following wallet types:

|                  | Multisig Cold | Multisig Hot | MPC Cold | MPC Hot |
| ---------------- | ------------- | ------------ | -------- | ------- |
| **Custody**      | ✅            | ❌            | ✅       | ❌      |
| **Self-Custody** | ✅             | ✅            | ✅       | ✅      |

## Ticker Symbols

| Mainnet   | Testnet  |
| ----------| -------  |
| baseeth   | tbaseeth |

## Faucet

You can use a faucet to obtain free testnet BaseETH for development and testing purposes.

**Faucet:** <a href="https://docs.base.org/base-chain/network-information/network-faucets" target="_blank" rel="noreferrer">https://docs.base.org/base-chain/network-information/network-faucets</a>


## Units

Each BaseETH consists of `1,000,000,000,000,000,000` (<code>10<sup>18</sup></code>) wei, so not even a single BaseETH can be stored numerically without exceeding the range of JavaScript numbers. Gas fees use gwei.

- 1 BaseETH = <code>10<sup>18</sup></code> wei
- 1 wei = <code>10<sup>-18</sup></code> BaseETH
- 1 gwei = <code>10<sup>-9</sup></code> BaseETH

For that reason, only string balance properties are available, which are `balanceString`, `confirmedBalanceString`, and
`spendableBalanceString`.

## Tokens

The BaseETH blockchain natively supports tokens .

## Create Wallet

```shell cURL
export BITGO_EXPRESS_HOST="<YOUR_LOCALHOST>"
export COIN="tbaseeth"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
export LABEL="<DESIRED_WALLET_NAME>"
export PASSPHRASE="<YOUR_BITGO_LOGIN_PASSPHRASE>"
export ENTERPRISE_ID="<YOUR_ENTERPRISE_ID>"

curl -X POST \
 http://$BITGO_EXPRESS_HOST/api/v2/$COIN/wallet/generate \
 -H 'Content-Type: application/json' \
 -H "Authorization: Bearer $ACCESS_TOKEN" \
  -d '{
    "label": "'"$LABEL"'",
    "passphrase": "'"$PASSPHRASE"'",
    "enterprise": "'"$ENTERPRISE_ID"'",
    "walletVersion": 4
}'
```
```js JavaScript
bitgo
  .coin('tbaseeth')
  .wallets()
  .generateWallet({
    label: 'My Test Wallet',
    passphrase: 'secretpassphrase1a5df8380e0e30',
    enterprise: '5612c2beeecf83610b621b90964448cd',
    walletVersion: 4,
  })
  .then(function (wallet) {
    // print the new wallet
    console.dir(wallet);
  });
```

## Create Address

```shell cURL
export WALLET="585c51a5df8380e0e3082e46"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"

curl -X POST \
-H "Authorization: Bearer $ACCESS_TOKEN" \
https://app.bitgo-test.com/api/v2/tbaseeth/wallet/$WALLET/address

```
```js JavaScript
bitgo
  .coin('tbaseeth')
  .wallets()
  .getWallet({ id: '585c51a5df8380e0e3082e46' })
  .then(function (wallet) {
    return wallet.createAddress();
  })
  .then(function (newAddress) {
    // print new address details
    console.dir(newAddress);
  });
```

## Consolidate Balance

Consolidation Fee Source: BaseETH Gas Tank

BaseETH uses forwarders, so it does not support manual consolidation

## Estimate Fee

```shell cURL
export COIN="tbaseeth"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"

curl -X GET \
 https://app.bitgo-test.com/api/v2/$COIN/tx/fee \
 -H 'Content-Type: application/json' \
 -H "Authorization: Bearer $ACCESS_TOKEN"

```
```js JavaScript
const BitGoJS = require('../../../src/index.js');
const bitgo = new BitGoJS.BitGo({ env: 'test' });
const accessToken = '<YOUR_ACCESS_TOKEN>';
const coin = 'tbaseeth';

async function getFeeEstimate() {
  try {
    await bitgo.authenticateWithAccessToken({ accessToken });
    const res = await bitgo.coin(coin).feeEstimate({ numBlocks: 2 });
    console.dir(res);
  } catch (err) {
    console.error('Error fetching fee estimate:', err);
  }
}

getFeeEstimate();

```

## Transact

Withdrawal Fee Source: Wallet Base Address

```shell cURL
export BITGO_EXPRESS_HOST="<YOUR_LOCALHOST>"
export COIN="tbaseeth"
export WALLET_ID="<YOUR_WALLET_ID>"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
export ADDRESS="<DESTINATION_ADDRESS>"
export AMOUNT="<AMOUNT_IN_BASE_UNITS>"
export WALLET_PASSPHRASE="<YOUR_WALLET_PASSPHRASE>"

curl -X POST \
 http://$BITGO_EXPRESS_HOST/api/v2/$COIN/wallet/$WALLET_ID/sendcoins \
  -H 'Content-Type: application/json' \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -d '{
    "address": "'"$ADDRESS"'",
    "amount": "'"$AMOUNT"'",
    "walletPassphrase": "'"$WALLET_PASSPHRASE"'"
}'
```
```shell cURL (send to many)
export BITGO_EXPRESS_HOST="<YOUR_LOCALHOST>"
export COIN="tbaseeth"
export WALLET_ID="<YOUR_WALLET_ID>"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
export ADDRESS_1="<DESTINATION_ADDRESS_1>"
export AMOUNT_1="<AMOUNT_1_IN_BASE_UNITS>"
export WALLET_PASSPHRASE="<YOUR_WALLET_PASSPHRASE>"

curl -X POST \
  http://$BITGO_EXPRESS_HOST/api/v2/$COIN/wallet/$WALLET_ID/sendmany \
  -H 'Content-Type: application/json' \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -d '{
    "recipients": [
    {
      "address": "'"$ADDRESS_1"'",
      "amount": "'"$AMOUNT_1"'"
    }
  ],
    "walletPassphrase": "'"$WALLET_PASSPHRASE"'"
}'
```
```js JavaScript
const tx = await fundedWallet.send({
    address: `<DESTINATION_ADDRESS>`,
    amount: `<AMOUNT>`,
    walletPassphrase: process.env.PASSWORD as string,
  });
```
```js JavaScript (send to many)
let params = {
  recipients: [
    {
      amount: "<AMOUNT_1>",
      address: "<DESTINATION_ADDRESS_1>",
    }
  ],
  walletPassphrase: "<YOUR_WALLET_PASSPHRASE>",
};
wallet.sendMany(params).then(function (transaction) {
  // Print transaction details
  console.dir(transaction);
});
```

## See Also
- [Create MPC Wallets](/docs/wallets-create-mpc-keys)
- [Trading Overview](/docs/trade-overview)
- [Withdraw from Wallet - Custody MPC](/docs/withdraw-wallet-type-custody-mpc)
- [Withdraw from Wallet - Self-Custody MPC (Manual)](/docs/withdraw-wallet-type-self-custody-mpc-manual)
- [Withdraw from Wallet - Self-Custody MPC (Simple)](/docs/withdraw-wallet-type-self-custody-mpc-simple)